PDF malware analysis — malicious · f24380026103cd9b

MALICIOUS

PDF

81.6 KB Created: 2020-12-15 23:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 55832de7960842e5bdcd011159b1fb82 SHA-1: 2ca6b08bd486f36b0347e5cb64ea260028c99804 SHA-256: f24380026103cd9be3a9a1f20fd76f364320b1638d52aeeb6d3dcd74d8dd2a26

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://traffmen.ru/strik?utm_term=purevpn+server+list%252Fhostname In PDF document text
- https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/dafad615147d3.pdfIn PDF document text
- https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/0c53234bb0e2.pdfIn PDF document text
- https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/24893fae73c2b0.pdfIn PDF document text
- https://wemuxafav.weebly.com/uploads/1/3/4/8/134860001/fitabow.pdfIn PDF document text
- https://gozibaduvixumu.weebly.com/uploads/1/3/4/6/134628844/gopukunetazodod_kuxep_babudu.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/panokojol/chemistry_unit_1_worksheet_3_answer_key.pdfIn PDF document text
- https://static1.squarespace.com/static/5fc56b1160f2895dc1062760/t/5fcf495f505b451de189c306/1607420258310/246683170.pdfIn PDF document text
- https://static1.squarespace.com/static/5fc0d57abd14ff0dd29c5223/t/5fc470371972c46e3c2bb0ed/1606709304632/90008773224.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/954d33a2-119f-4449-8c3d-d47208da93b2/codigo_penal_puerto_rico.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d36296aa-9e59-479b-b249-2d6e47679d0a/90590132169.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/13006cc1-77e8-44eb-87f1-7c2437e57d35/merry_christmas_alex_cross.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9cc09e12-1065-4093-9787-ecbbfd3ad05b/immortal_syndicate_guide_poe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bab3763e-f96b-4a63-be0c-abb34d080266/jofazujixovunumixosa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7f3aa4a1-a98b-4a50-832d-09a63d3af54b/nifitidorububidolamisu.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off000113f1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x113F1	21904 bytes
SHA-256: `005c0fffe82d394620b881a3e7cb4eb3e0d42f7be1920157fd70f82ac81e24ce`
`font_00_sfnt_off0000dcad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAD	5156 bytes
SHA-256: `5d220f8809d0db0bfc300d0c41836e1991c99b964e03454debd9b4f2375ea9fa`
`font_01_sfnt_off0000ee17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE17	11276 bytes
SHA-256: `75c55ab1f38949912bfd1a8a0b4b83fed119918c84ce21b17d7b2eeec5758cfc`

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